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AAT4290/91
I/O Expander Load Switches with Serial Control General Description
The AAT4290 and AAT4291 SmartSwitch products are members of AnalogicTech's Application Specific Power MOSFETTM (ASPMTM) product family. The AAT4290 and AAT4291 are five and three P-channel MOSFETs, respectively, configured for use as a microprocessor I/O expander. Having independent drain outputs and a common source input, they operate with an input voltage ranging from 1.8V to 5.5V, making them ideal for 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries. Each switch features a 500ns turn-on time. The switch states are controlled by AnalogicTech's Simple Serial ControlTM (S2CwireTM) interface which permits ease of control and efficiency of size. The quiescent supply current is very low, typically 5A. In shutdown mode, the supply current is reduced to less than 1A. The AAT4290 and AAT4291 are offered in a Pbfree, 8-pin SC70JW package specified over the -40C to +85C temperature range.
Features
* * * * *
SmartSwitchTM
* *
1.8V to 5.5V Input Voltage Range 5 or 3 Independent Load Switches S2Cwire Interface 1.1 RDS(ON) Per Switch Low Quiescent Current -- 5A -- 0.1A in Shutdown -40C to +85C Temperature Range 8-Pin SC70JW Package
Applications
* * * * * Cell Phones I/O Expansion Multiple Low Power Switching Personal Communication Devices Portable Electronic Devices
Typical Application
INPUT
IN
OUT1 OUT2
OUT1 OUT2 OUT3 OUT4 OUT5
AAT4290
EN/SET EN/SET
OUT3 OUT4 OUT5
GND
CIN 1F COUT1 0.1F COUT2 0.1F COUT3 0.1F COUT4 0.1F COUT5 0.1F
GND
GND
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AAT4290/91
I/O Expander Load Switches with Serial Control Pin Descriptions
Pin #
AAT4290 AAT4291
Symbol
IN OUT2 OUT1 EN/SET
Function
Input power supply is connected to the P-channel MOSFET sources. Connect a 1F capacitor from IN to GND. P-channel MOSFET drain. P-channel MOSFET drain. Input control pin using S2Cwire serial interface. The device records rising edges of the clock and decodes them into 32 states (8 states for AAT4291) which controls the ON/OFF states of the MOSFETs. See Table 1 and Table 2 for output settings. Ground connection. P-channel MOSFET drain. P-channel MOSFET drain. P-channel MOSFET drain. Not connected.
1 2 3 4
1 7 6 4
5 6 7 8 N/A
5 N/A N/A 8 2, 3
GND OUT5 OUT4 OUT3 N/C
Pin Configuration
AAT4290 SC70JW-8 (Top View) IN OUT2 OUT1 EN/SET
1 2 3 4 8 7 6 5
AAT4291 SC70JW-8 (Top View) OUT3 OUT4 OUT5 GND IN N/C N/C EN/SET
1 2 3 4 8 7 6 5
OUT3 OUT2 OUT1 GND
2
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AAT4290/91
I/O Expander Load Switches with Serial Control Absolute Maximum Ratings1
Symbol
VIN VOUT VEN/SET IMAX TSTORAGE VESD
Description
IN to GND OUT to GND EN/SET to GND Maximum Continuous Switch Current Storage Temperature Range ESD Rating - HBM2
Value
-0.3 to 6.0 -0.3 to VIN + 0.3 -0.3 to 6.0 250 -65 to 150 4000
Units
V V V mA C V
Thermal Characteristics
Symbol
JA PD
Description
Thermal Resistance Maximum Power Dissipation (TA = 25C)4
3
Value
225 440
Units
C/W mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time. 2. Human body model is a 100pF capacitor discharged through a 1.5k resistor to each pin. 3. Mounted on the board. 4. Derate 4.4mW/C above 25C. 4290.2006.03.1.2
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AAT4290/91
I/O Expander Load Switches with Serial Control Electrical Characteristics
VIN = 5.0V, TA = -40C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol
VIN IQ IQ(OFF) ISD(OFF) VUVLO VUVLO(hys) RDS(ON)
Description
Operation Voltage Quiescent Current Off Supply Current Off Switch Current Under-Voltage Lockout Under-Voltage Lockout Hysteresis
Conditions
VIN = 5.5V, EN/SET = VIN, IOUT = 0, All Switches ON EN/SET = 0, VIN = 5.5V, VOUT Open EN/SET = 0, VIN = 5.5V, VOUTn = 0 VIN Falling VIN VIN VIN VIN = = = = 1.8V, TA 3.0V, TA 4.2V, TA 5.0V, TA = = = = 25C 25C 25C 25C
Min
1.8
Typ Max
5.5 4.5 8 1 1
Units
V A A A V mV
On Resistance
0.1 1.2 250 2.5 1.5 1.2 1.1 2800
3.8 2.2 1.8 1.7
On Resistance Temperature Coefficient AAT4290-1 and AAT4291-1 TD(ON) Output Turn-On Delay Time TR Turn-On Rise Time TD(OFF) Turn-Off Delay Time EN/SET VEN(L) Enable Threshold Low VEN(H) Enable Threshold High TLO EN/SET Low Time TCRDS THI TO TLAT ISINK Minimum EN/SET High Time EN/SET Off Timeout EN/SET Latch Timeout EN/SET Input Leakage
ppmC
VIN = 5V, RLOAD = 500, COUT = 0.1F VIN = 5V, RLOAD = 500, COUT = 0.1F VIN = 5V, RLOAD = 500 VIN = 1.8V VIN = 5.5V VEN/SET < 0.4V VIN 2.5V VIN > 2.5V
40 270 40 0.4 1.6 100 500 250 4.0 4.0 1
ns ns ns V V ns ns s s A
VEN/SET = 5.5V
2.6 2.6 0.01
1. The AAT4290/91 is guaranteed to meet performance specifications over the -40C to +85C operating temperature range and is assured by design, characterization, and correlation with statistical process controls.
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AAT4290/91
I/O Expander Load Switches with Serial Control Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C. Quiescent Current vs. Temperature
6 5.5 5 4.5 5.5 5
Quiescent Current vs. Input Voltage
VIN = 5.0V IQ (A) VIN = 3.3V
-40 -20 0 20 40 60 80 100
4.5 4 3.5 3 2.5 2 1.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IQ (A)
4 3.5 3 2.5 2
Temperature (C)
Input Voltage (V)
VIH and VIL vs. Input Voltage
1.4 1.3 1.2
2.7 2.5
RDS(ON) vs. Input Voltage
IO1-5 = 100mA
VIH RDS(ON) ()
2.3 2.1
VIH and VIL (V)
1.1 1 0.9 0.8 0.7
1.9 1.7 1.5 1.3 1.1 0.9
RDS5 RDS1 RDS2 RDS3
VIL
RDS4
3.0 3.5 4.0 4.5 5.0 5.5
0.6 0.5
0.7
1.5 1.5 2 2.5 3 3.5 4 4.5 5 5.5
2.0
2.5
Input Voltage (V)
Input Voltage (V)
RDS(ON) vs. Temperature
1.3 1.2 1.1
RDS(ON) vs. Temperature
1.4 1.3
VIN = 5.0V IO1-5 = 50mA RDS2 RDS(ON) () RDS1 RDS5 RDS4
VIN = 5.0V IO1-5 = 100mA RDS2 RDS1 RDS5
1.2 1.1 1.0 0.9 0.8 40 60 80 100 0.7 -40
RDS(ON) ()
1 0.9 0.8 0.7 -40
RDS4 RDS3
-20 0 20 40 60 80 100
RDS3
-20 0 20
Temperature (C) 4290.2006.03.1.2
Temperature (C)
5
AAT4290/91
I/O Expander Load Switches with Serial Control Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C. EN/SET Latch Timeout vs. Temperature
3.4 3.4 3.2 3 2.8 2.6 2.4 2.2 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100
EN/SET Off Timeout vs. Temperature
Latch Timeout, tLAT (s)
3 2.8
Off Timeout, tO (s)
3.2
VIN = 3.3V
VIN = 3.3V
2.6
VIN = 5.0V
2.4 2.2 -40
VIN = 5.0V
Temperature (C)
Temperature (C)
EN/SET Timeout vs. Input Voltage
4.3 4.1 3.9
Turn-On Characteristic
(VIN = 5V, RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
Timeout (s)
3.7 3.5 3.3 3.1 2.9 2.7 2.5 1.5 2 2.5 3 3.5 4 4.5 5 5.5
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Input Voltage (V) Time (2s/div)
Off Timeout tO
Latch Timeout tLAT
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Time (2s/div)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Time (2s/div)
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AAT4290/91
I/O Expander Load Switches with Serial Control Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C. Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
Turn-Off Characteristic
(VIN = 5V; RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Time (2s/div)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Time (2s/div)
Transition of Outputs
(VIN = 5V; RL1 = RL2 = 50; CO1 = CO2 = 0.1F)
Turn-On Transient Characteristic
(VIN = 5V; RL1 = RL2 = 50)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div) Time (2s/div)
VO2 (100mV/div, AC coupled) VO1 (5V/div) EN/SET (5V/div)
Time (5s/div)
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AAT4290/91
I/O Expander Load Switches with Serial Control Functional Block Diagram
IN
OUT1 OUT2 OUT3 OUT4* OUT5*
UVLO
Control Logic and Level Shift ROM
EN/SET
S2Cwire Interface
GND
*AAT4290 only
Functional Description
The AAT4290 consists of five P-channel MOSFET power switches designed for I/O expansion applications. The AAT4291 has all of the features offered in the AAT4290, but integrates three switches instead of five. It operates with input voltages ranging from 1.8V to 5.5V which, along with its extremely low operating current, makes it ideal for battery-powered applications. In cases where the input voltage drops below 1.8V, the AAT4290 MOSFETs are protected from entering the linear region of operation by automatically shutting down. In addition, the TTL-compatible EN/SET pin makes the AAT4290 an ideal level-shifted load switch. An optional slew rate controlling feature eliminates inrush current when a MOSFET is turned on, allowing the AAT4290 to be implemented with a small input capacitor or no capacitor at all, while maintaining isolation between channels. During slewing, the current ramps linearly until it reaches the level required for the output load condition. The proprietary control method works by careful control 8
and monitoring of the MOSFET gate voltage. When the device is switched ON, the gate voltage is quickly increased to the threshold level of the MOSFET. Once at this level, the current begins to slew as the gate voltage is slowly increased until the MOSFET becomes fully enhanced. Once it has reached this point, the gate is quickly increased to the full input voltage and RDS(ON) is minimized. The ON/OFF state of the five MOSFET switches are controlled by the EN/SET serial data input. An internal control counter is clocked on the rising edge of the EN/SET pin and is decoded into the 32 possible states of the MOSFET (see Table 1). The counter rolls over after 32 clocks and the table repeats. The counter can be clocked at speeds up to 1MHz, but the count value is not latched until clocking has stopped and the EN/SET pin has remained high for approximately 2.6s. The first rising edge of EN/SET enables the AAT4290 and is counted as the first clock. To change states, additional low going clock pulses may be asserted on the EN/SET pin with the resulting change taking
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AAT4290/91
I/O Expander Load Switches with Serial Control
effect after the EN/SET pin has remained in a high state for TLAT. The AAT4290 is disabled after the EN/SET pin has transitioned and remained in a logic low state for TO. With the exception of three channel power switches, the AAT4291 has a similar function to the AAT4290. The ON/OFF state of the three MOSFET switches are controlled by the EN/SET serial data input. An internal control counter is clocked on the rising edge of the EN/SET pin and is decoded into the eight possible states of the MOSFET (see Table 2). The counter rolls over after eight clocks and the table repeats.
Clock OUT5 OUT4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 on on on on on on on on on on on on on on on on off off off off off off off off off off off off off off off off on on on on on on on on off off off off off off off off on on on on on on on on off off off off off off off off
OUT3
on on on on off off off off on on on on off off off off on on on on off off off off on on on on off off off off
OUT2 OUT1
on on off off on on off off on on off off on on off off on on off off on on off off on on off off on on off off on off on off on off on off on off on off on off on off on off on off on off on off on off on off on off on off
Clock
1 2 3 4 5 6 7 8
OUT3
on on on on off off off off
OUT2
on on off off on on off off
OUT1
on off on off on off on off
Table 2: AAT4291 Output Settings.
Applications Information
Thermal Considerations
The AAT4290 is designed to deliver continuous output load currents. Due to its high level of integration, care must be taken in designing for higher load conditions. If greater loads are required, outputs can be tied together to deliver higher power to a given load. At 25C ambient, the AAT4290 is capable of dissipating 440mW of power, or 1.14A at 5.0V, for an average current of 228mA per output. At 85C ambient, the AAT4290 is capable of dissipating 178mW of power, or 0.72A at 5.0V, for an average current of 145mA per output.
Table 1: AAT4290 Output Settings.
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AAT4290/91
I/O Expander Load Switches with Serial Control
Timing Diagram
OUTn
THI TLO TLAT TD(ON) TR TO TD(OFF)
EN/SET
Output Sequencing
If output sequencing is not necessary, then all of the outputs will be switched on simultaneously on the first rising edge of the EN/SET pin. However, if output sequencing is desired, then a series of pulses on the EN/SET pin will accomplish this. Each time a new group of pulses is asserted on EN/SET, the AAT4290/91 internal control is reset. For example,
to sequence the outputs in order from OUT5 to OUT1, five clocks bursts are input on the EN/SET pin. From Table 1, the first burst of 16 clocks turns on OUT5. A following burst of 8 clocks (as the counter resets) will add OUT4, followed by 4 clocks to add OUT3, 2 clocks to add OUT2, and 1 clock to add OUT1. Likewise, the outputs can be turned off in any order by adding more clock bursts.
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AAT4290/91
I/O Expander Load Switches with Serial Control Applications Circuits
VSUPPLY 1.8 to 5.5V AAT4290
IN OUT1 OUT2 OUT3 OUT4 OUT5
GPIO 1
EN/SET
EN 1
Function 1
System Controller
GPIO 2 GPIO 3 GPIO 4 GPIO 5
EN 2
Function 2
GPIO 2 to GPIO 5 are now free for other uses
EN 3
Function 3
EN 4
Function 4
EN 5
Function 5
Figure 1: GPIO I/O Expander (condense five GPIO control lines to one).
AAT3110IJS-5.0 SC70JW-8: 2x2mm VIN VOUT
AAT4291IJS SC70JW-8: 2x2mm IN OUT1 OUT2 10F OUT3 RGB LED 1F R EN/SET GND RR RG RB G B
VBATTERY
10F
C+
ON/OFF
SHDN GND
C-
CLOCK
Figure 2: RGB LED Control (eliminates three discrete MOSFET switches).
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AAT4290/91
I/O Expander Load Switches with Serial Control Ordering Information
Package
SC70JW-8 SC70JW-8
Marking1
HSXYY HCXYY
Part Number (Tape and Reel)2
AAT4290IJS-1-T1 AAT4291IJS-1-T1
All AnalogicTech products are offered in Pb-free packaging. The term "Pb-free" means semiconductor products that are in compliance with current RoHS standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
1.75 0.10 0.225 0.075 2.00 0.20
2.20 0.20
0.048REF 0.15 0.05
0.85 0.15
1.10 MAX
0.100
7 3
0.45 0.10 2.10 0.30
4 4
All dimensions in millimeters.
1. XYY = assembly and date code. 2. Sample stock is generally held on part numbers listed in BOLD.
(c) Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech's standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085 Phone (408) 737-4600 Fax (408) 737-4611 12
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0.05 0.05

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